Initial results from a successful laser-controlled
collective ion acceleration experiment at the
University of Maryland are presented. In the
experiment, positive ions are trapped in the potential
well at the head of ...

Presents a study on the generation of microwave radiation at high harmonics of the cyclotron frequency. Reasons for the interest in the configuration process; Theory of beam dynamics; Results of the experiments.

Presents a study which examined the propagation of intense relativistic electron beams into evacuated nonconducting drift tubes after passage through a localized plasma source. Details of the time-integrated photographs ...

The generation of microwave radiation by the interaction
of a low-energy rotating electron beam (25 kV, 0.5 A, 5 ps) with an
azimuthally periodic magnetic wiggler field has been studied experimentally.
Narrow-band ...

We will report on the status of a new mm-wave
FEL research program based on short-period
electromagnet wigglers and a low voltage (500 kV)
sheet electron beam. Recent results of
measurements and theoretical modeling ...

An auxiliary magnetic cusp transforms
rotational motion in the spent beam of a Large-Orbit
Gyrotron into axial motion. Results
regarding the interfacing of this cusp with a
depressed collector region and the effects ...

Depressed collectors are extensively used in linear-beam devices. In spiraling
beam devices, the motion of the spent beam needs to be converted into axial
motion before it can deliver energy to the retarding axial ...

Relativistic backward wave oscillators (BWOs) have proven to be relatively efficient,
high-power microwave sources in the centimeter wavelength range. Recent Soviet results
have indicated that the use of a background ...

The propagation of high-power 00-200 kW/cm2
) short-burst (3-30 ns) microwave pulses in
the atmosphere has been studied experimentally. Microwave power from a large orbit gyrotron
operating at 9.6 GHz is focused by a ...

Experimental and theoretical studies at the University of
Maryland on the production of high-power microwave radiation in
cusp-injected, large-orbit devices are reviewed. Three classes of devices
belonging to this ...

High-power microwave radiation at 8 GHz from a gas-fined backward wave oscillator driven
by an intense relativistic electron beam has been measured. It has been observed that an order
of magnitude resonant increase in ...

The use of a small period wiggler (Cw < 1 cm) together with a sheet electron beam
has been proposed as a low cost source of power for electron cyclotron resonance heating
(ECRH) in magnetic fusion plasmas. Other potential ...

An experimental demonstration of a strong enhancement of the interaction efficiency in a high-power
relativistic backward-wave oscillator when plasma is injected is presented. Controlled plasma injection
enhances the ...

In the Laser Controlled Collective Accelerator, an intense
electron beam is injected at a current above the vacuum space
charge limit into an initially evacuated drift tube. A plasma
channel, produced by time-sequenced, ...